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MC34844
ELECTRICAL CHARACTERISTICS
STATIC AND DYNAMIC ELECTRICAL CHARACTERISTICS
Table 4. Static and Dynamic Electrical Characteristics (continued)
Characteristics noted under conditions V IN = 12 V, V OUT = 42 V, I LED = 50 mA, PWM = VDC1, M/~S = VDC1,
PIN & NIN = VDC1, - 40 ° C ≤ T A ≤ 105 ° C, PGND = 0 V, unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Unit
PWM GENERATOR
PWM Frequency Range (13)
fPWM S
100
-
25000
Hz
M/~S = Low (Slave Mode)
PWM Frequency
M/~S = High (Master Mode)
fPWM M
Hz
FPWM Register = 768
FPWM Register = 192,000
22500
90
25000
100
27500
110
PWM dimming resolution
t fPWM
-
0.39
-
%
PWM PIN (DIRECT PWM CONTROL)
Input PWM Pin Minimum Pulse (13)
Input PWM Frequency Range
t PWM_IN
fPWM
150
100
-
-
-
23000
ns
Hz
PHASE LOCK LOOP
CK Slave Mode Frequency Lock Range (12)
fCK S
100
-
25000
Hz
M/~S = Low (Slave Mode)
CK Slave Mode Input Jitter (13)
fCK S_JITTER
-
-
0.1
%
M/~S = Low (Slave Mode)
Slave Mode Acquisition Time
M/~S = Low (Slave Mode)
T S_ACQ
FPWM S =25 kHz
FPWM S =100 Hz
-
-
-
2000
50
-
ms
ms
CK Frequency (Master Mode)
fCK MASTER
FPWM Register = 768
FPWM Register = 192,000
22500
90
25000
100
27500
110
Hz
I 2 C/SM BUS PHYSICAL LAYER [SCK, SDA]
Interface Frequency Range
f SCK
400
kHz
SM Bus Power-on-Reset Time
Output fall time
t RST
t F
-
40
-
-
100
160
ms
ns
10 ρ F < C L < 400 ρ F
Output rise time
t R
20
-
80
ns
10 ρ F<C L <400 ρ F
LOGIC OUTPUT (CK)
Output Rise and Fall time (12)
t R /t F
-
-
25
ns
C L <100 ρ F
LED CHANNELS
Channels Rise and Fall Time (13)
t R /t F
-
23
50
ns
Notes
12. Special considerations should be made for frequencies between 100 Hz to 1.0 KHz. Please refer to Functional Device Operation for
further details.
13. Guaranteed by design
34844
Analog Integrated Circuit Device Data
13
Freescale Semiconductor
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